| With the rapid development of industry, the pollution to potable water andsoil caused by industrial wastewater is becoming more and more serious,threatening human health and safety directly. Monitoring the type and contentof heavy metals in industrial wastewater is an important prerequisite to handleit properly. Therefore, we urgently need an analysis technique which candetect heavy metals in waste water quickly and accurately. The accuracy ofexisting methods for analysis of heavy metals in polluted water are relativelyhigh, but they can’t achieve request of rapid, real-time, online as well as theability to multi-element analysis for the reason of sampling, samplepre-treatment and having a long time for analysis. Laser induced breakdownspectroscopy (LIBS) is widely used in the qualitative and quantitativeanalysis of trace elements by virtue of it’s high resolution, high sensitivity andno need for pre-treatment.In this paper, we analyzed the mixed solution containing seven kinds ofmetal elements such as Cr, Cd, Fe, Ca, Al, Mn, Pb using single and dualnanosecond pulse LIBS in a homemade liquid jet device within the region of348nm~411nm. In order to enhance signal to noise ratio (SNR), pulseenergy, ICCD gate delay, gate width, gain and other experimental parameterswere optimized，the best parameters are: ICCD gate delay4200ns，pulse energy30mJ, ICCD gain170，ICCD gate width3000ns. With the optimizedparameters, the limit of detection (LOD) for each element was obtained by themeasured calibration curves. LODs under this vertical jet experimental systemare Cr(0.427ppm)、Cd(41.231ppm)、Fe(4.155ppm)、Ca(0.018ppm)、Al(0.530ppm)、Mn(0.682ppm)、Pb(6.056ppm), reflecting the potential ofLIBS at detecting a variety of heavy metals in water; This will providevaluable data and theory foundation for the utility of LIBS technology. |
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